"s/o" meaning in French

{
  "forms": [
    {
      "form": "o",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "adjective"
      },
      "expansion": "o",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "not applicable",
          "word": "sans objet. n/a"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Canadian French",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of sans objet. n/a (not applicable)"
      ],
      "id": "en-s/o-fr-adj-ZEX8mpdd",
      "links": [
        [
          "sans objet",
          "sans objet#French"
        ],
        [
          "n/a",
          "n/a"
        ],
        [
          "not applicable",
          "not applicable"
        ]
      ],
      "raw_glosses": [
        "(Canada) Abbreviation of sans objet. n/a (not applicable)"
      ],
      "tags": [
        "Canada",
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "s/o"
}

{
  "forms": [
    {
      "form": "o",
      "tags": [
        "canonical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "adjective"
      },
      "expansion": "o",
      "name": "head"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "not applicable",
          "word": "sans objet. n/a"
        }
      ],
      "categories": [
        "Canadian French",
        "French abbreviations",
        "French adjectives",
        "French entries with incorrect language header",
        "French lemmas"
      ],
      "glosses": [
        "Abbreviation of sans objet. n/a (not applicable)"
      ],
      "links": [
        [
          "sans objet",
          "sans objet#French"
        ],
        [
          "n/a",
          "n/a"
        ],
        [
          "not applicable",
          "not applicable"
        ]
      ],
      "raw_glosses": [
        "(Canada) Abbreviation of sans objet. n/a (not applicable)"
      ],
      "tags": [
        "Canada",
        "abbreviation",
        "alt-of"
      ]
    }
  ],
  "word": "s/o"
}

{
  "called_from": "form_descriptions/2278",
  "msg": "suspicious alt_of/form_of with '. ': sans objet. n/a",
  "path": [
    "s/o"
  ],
  "section": "French",
  "subsection": "adjective",
  "title": "s/o",
  "trace": ""
}